Why is there the difference between the two type router in "show ip inter bri" -- IPCP and NVRAM?

Hi Expert
I have two same type routers with the same configuration. But When I using command "show ip int bri" in two same type of router, I noticed there is a little difference in the output of the command for the two routers. Please see the picture. What is differnece between NVRAM and IPCP there ?  Why is there the difference between the two router with the same configuration ? Any expert can give some suggestion ? Thank you.
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EESkyAsked:
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it_saigeDeveloperCommented:
The configuration means that the interface on RouterA is negotiated (most likely via PPP)
Whereas the interface on RouterB is statically assigned and therefore stored in the configuration file and running from NVRAM.

-saige-
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EESkyAuthor Commented:
Thank you so much for your fast reply. The two interfaces in two routers are same Cellular interface, which connect with other ends through wireless, respectively. So what you meant is other end might be PPP or something else ?
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it_saigeDeveloperCommented:
Yes, but the local configuration tells them to do this.

-saige-
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EESkyAuthor Commented:
Thank you so much. I think you already answered my question.
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